I bought a little quarter/welsh pony years ago for my kids....His name was JoJo, but I called him "pony from he**" because he surely was the son of satan! LOL!
NO one could catch the little twerp, except one of the kids (occasionally).
I put him in a stall once. Needless to say by morning there was very little left of the stall. He literally tore it apart over night and got out.
There was also no fence on the planet that would hold him. He got out of every fence he was put behind, including field fencing.
When he was ridden, he was fine if he were led around...but if you tried to just ride him without someone on the other end of a lead line, he would rear up, twist and come down hard, unseating whoever was on him.
One time we loaded him in our trailer and were in the process of loading a mare next to him when he went on a kicking spree and opened up the mare's leg. I could have strangled that little so-and-so right on the spot!
To this day, since JoJo, I've had no use for ponies. In fact, I figured mini horses were just glorified ponies, until I actually met one. Now I've got 2 and wouldn't trade them for all the tea in china. My grandkids will be much better mounted than their mom and dad were. Can't wait till this summer to see them enjoying their little horses!